Boiler



M. P. Boss.

BDILER.

(Application med sept. 2q, 139s.)

Patented lune 20, |899.

(No Model.)

4 Sheets-Sheei l.

No. 627,321. Patented lune 20, |1899. M. P. BOSS.

BOILER.

(Application filed Sept 26, 189

4 Sheet (No Modell) I il- No. 627;32I. Patented lune 20, |899. M." P. BDSS.

BUILER.

(Application led Sept. 26, 1898.)

(No Model.) 4 Sheets-Sheet 4.

wmf/34M. i dM/ve/Wbo.

N @gg UNITED STATES PATENT OEEIcE.

MARTIN P. BOSS, SAN FRANCISCO, CALIFORNIA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 627,321, dated June 20, 1899.

l Application filed September 26,1898. Serial No. 691,932. (N0 mOdel.)

To all whom, t may concern.-

Be it known'that I, MARTIN P. BOSS, a citizen of the United States, residing in the city and county of San Francisco and State of Oalifornia,have invented certain new and useful Improvements in Boilers; and I do hereby declare the following to be a full, clear, and exact description of the same.

My invent-ion relates to that class of boilers having water-tubes connecting two watercylinders which are exposed to the fire only from the outside.

` My invention consists of a plurality of series or groups `of water-tubes connecting two cylinders, each series orgroup of tubes being so segregated and inclosed that the space around and between the tubes shall form a iiue, except that the base of the iirst series of tubes may spring from the midst or lat one side of the hre-chamber.

My invention also consists of other details of construction and arrangement, all of which I shall hereinafter fully describe.

The general object of my invention is to provide a simple and efficient watertube boiler with maximum heating-surface, good water circulation, deposit of sediment below lire-level, and accessibility and convenience for cleaning and repairs, and also free expansion and contraction.

Referring to the accompanying drawings, Figure lis a longitudinal section through the boiler, which in this case shows but two series of tubes. Fig. 2 is a transverse section on line Qc a; of Fig. 1 through fire-chamber and iirst series of tubes. Fig. 3 is a transverse section on line yy of Fig. l through the last series of tubes and the base of thechimney. Fig. 4 'is a front elevation of the complete boiler. Fig. is a'plan.

A and B are the two cylinders connected by the separated series or groups of tubes C and C.

D is the fire-chamber, and E the base of the chimney. v

The group of tubesC and C', it will be seen, are separated by a wall H, and the spaces inclosing the tubes form lues through which the heat-currents pass. At the upper portion these liues are widened out, as shown in Fig. 2, to form a flue F in proximity to the upper cylinder B, said widened iiue F extend= ing across the two series or groups of tubes, thus providing ample capacity for the heatcurrents to pass from series C to series C'.

If the flue were not widened at- F, the division-wall I-I could not be carried so high without restricting t-he heatcurrents,and the upper end of the tubes farthest from the division-wall H would be wholly without the heatcurrents, and therefore less effective.

In operation the ianle passes from firechamber D vertically through flue containing group C and horizontally through flue F, thence downward through iiue of group C', and out at a side openinginto the chimney E.

To enable the connecting of the straight vertical tubes to the water-cylinders A and B and to keep them all parallel throughout, I

interpose into a side of each cylinder a flat.

plate K sufficiently thick to withstand Without bulging the great pressure within the cylinder. This plate is ianged at the sides, as shown at k, Fig. 2, to conform to the curvature of the cylinder in order to facilitate the riveting of it into the cylinder. The form of this plate is such that it may be rolled, as bar-iron, (at a rolling-mill,) of any desired length.

To enable the removal or the replacing of a tube, I put into upper cylinder B a removable plate m opposite to each series of tubes, through which opening any tube may be removed byfirst removing the plate.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. The combination'with a furnace having a plurality of flues for the products of coml` bustion communicating to give alternate currents in opposite directions, of a lower water` cylinder extending from one iue into the next flue, an upper cylinder extending from one fine into the next, and a group or nest of vertical wateratubes in each iiue connecting the upper and lower cylinders, substantially as described. y

2. The combination With a furnace having' a plurality of iiues communicating to give alternate currents in opposite directions, of a lower water-cylinder extending from'wone liuc into the next flue, an upper cylinder extend= ing from one flueinto the next, a group or nest of water-tubes in each iiue connecting ICO the upper and lower cylinders, the first nest of tubes and first lue being directly above the furnace combustion-chamber, substantially as described.

3. The combination with a furnace having a plurality of iiues communicating to give alternate currents in opposite directions, said iiues being enlarged at their upper and lower parts, of an upper and lower water-cylinder each extending from the enlarged part of one flue into the enlarged part of the next flue, and a group or nest of water-tubes in each lue connecting said upper and lower watercylinders, substantially as described.

4:. In a water-tube boiler having water-cylinders connected by a group or nest of watertubes, a removable plate .or cover in one of In witness whereof I hereunto setmy hand. i

MARTIN P. BOSS.

f Witnesses:

C. F. PATToN, F. E. VETRANO. 

